Engine, Not Centaur Stage, Blamed in NRO Shortfall
A malfunctioning hydrogen propellant valve in the Pratt & Whitney Rocketdyne (PWR) RL10 Centaur upper stage engine sent two National Reconnaissance Office ocean surveillance spacecraft into the wrong orbit during launch from Cape Canaveral June 15, and not the Centaur stage itself, the U.S. Air...
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